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3(3r-3)=27
We move all terms to the left:
3(3r-3)-(27)=0
We multiply parentheses
9r-9-27=0
We add all the numbers together, and all the variables
9r-36=0
We move all terms containing r to the left, all other terms to the right
9r=36
r=36/9
r=4
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